505 lines
18 KiB
PHP
505 lines
18 KiB
PHP
<?php
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/**
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* Zend Framework
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*
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* LICENSE
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*
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* This source file is subject to the new BSD license that is bundled
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* with this package in the file LICENSE.txt.
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* It is also available through the world-wide-web at this URL:
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* http://framework.zend.com/license/new-bsd
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* If you did not receive a copy of the license and are unable to
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* obtain it through the world-wide-web, please send an email
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* to license@zend.com so we can send you a copy immediately.
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*
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* @category Zend
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* @package Zend_Cache
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* @subpackage Zend_Cache_Backend
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* @copyright Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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* @version $Id: Memcached.php 22208 2010-05-20 16:59:02Z mabe $
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*/
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/**
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* @see Zend_Cache_Backend_Interface
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*/
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require_once 'Zend/Cache/Backend/ExtendedInterface.php';
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/**
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* @see Zend_Cache_Backend
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*/
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require_once 'Zend/Cache/Backend.php';
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/**
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* @package Zend_Cache
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* @subpackage Zend_Cache_Backend
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* @copyright Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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*/
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class Zend_Cache_Backend_Memcached extends Zend_Cache_Backend implements Zend_Cache_Backend_ExtendedInterface
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{
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/**
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* Default Values
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*/
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const DEFAULT_HOST = '127.0.0.1';
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const DEFAULT_PORT = 11211;
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const DEFAULT_PERSISTENT = true;
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const DEFAULT_WEIGHT = 1;
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const DEFAULT_TIMEOUT = 1;
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const DEFAULT_RETRY_INTERVAL = 15;
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const DEFAULT_STATUS = true;
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const DEFAULT_FAILURE_CALLBACK = null;
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/**
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* Log message
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*/
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const TAGS_UNSUPPORTED_BY_CLEAN_OF_MEMCACHED_BACKEND = 'Zend_Cache_Backend_Memcached::clean() : tags are unsupported by the Memcached backend';
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const TAGS_UNSUPPORTED_BY_SAVE_OF_MEMCACHED_BACKEND = 'Zend_Cache_Backend_Memcached::save() : tags are unsupported by the Memcached backend';
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/**
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* Available options
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*
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* =====> (array) servers :
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* an array of memcached server ; each memcached server is described by an associative array :
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* 'host' => (string) : the name of the memcached server
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* 'port' => (int) : the port of the memcached server
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* 'persistent' => (bool) : use or not persistent connections to this memcached server
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* 'weight' => (int) : number of buckets to create for this server which in turn control its
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* probability of it being selected. The probability is relative to the total
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* weight of all servers.
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* 'timeout' => (int) : value in seconds which will be used for connecting to the daemon. Think twice
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* before changing the default value of 1 second - you can lose all the
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* advantages of caching if your connection is too slow.
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* 'retry_interval' => (int) : controls how often a failed server will be retried, the default value
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* is 15 seconds. Setting this parameter to -1 disables automatic retry.
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* 'status' => (bool) : controls if the server should be flagged as online.
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* 'failure_callback' => (callback) : Allows the user to specify a callback function to run upon
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* encountering an error. The callback is run before failover
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* is attempted. The function takes two parameters, the hostname
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* and port of the failed server.
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*
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* =====> (boolean) compression :
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* true if you want to use on-the-fly compression
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*
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* =====> (boolean) compatibility :
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* true if you use old memcache server or extension
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*
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* @var array available options
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*/
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protected $_options = array(
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'servers' => array(array(
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'host' => self::DEFAULT_HOST,
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'port' => self::DEFAULT_PORT,
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'persistent' => self::DEFAULT_PERSISTENT,
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'weight' => self::DEFAULT_WEIGHT,
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'timeout' => self::DEFAULT_TIMEOUT,
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'retry_interval' => self::DEFAULT_RETRY_INTERVAL,
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'status' => self::DEFAULT_STATUS,
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'failure_callback' => self::DEFAULT_FAILURE_CALLBACK
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)),
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'compression' => false,
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'compatibility' => false,
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);
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/**
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* Memcache object
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*
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* @var mixed memcache object
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*/
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protected $_memcache = null;
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/**
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* Constructor
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*
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* @param array $options associative array of options
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* @throws Zend_Cache_Exception
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* @return void
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*/
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public function __construct(array $options = array())
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{
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if (!extension_loaded('memcache')) {
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Zend_Cache::throwException('The memcache extension must be loaded for using this backend !');
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}
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parent::__construct($options);
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if (isset($this->_options['servers'])) {
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$value= $this->_options['servers'];
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if (isset($value['host'])) {
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// in this case, $value seems to be a simple associative array (one server only)
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$value = array(0 => $value); // let's transform it into a classical array of associative arrays
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}
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$this->setOption('servers', $value);
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}
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$this->_memcache = new Memcache;
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foreach ($this->_options['servers'] as $server) {
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if (!array_key_exists('port', $server)) {
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$server['port'] = self::DEFAULT_PORT;
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}
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if (!array_key_exists('persistent', $server)) {
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$server['persistent'] = self::DEFAULT_PERSISTENT;
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}
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if (!array_key_exists('weight', $server)) {
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$server['weight'] = self::DEFAULT_WEIGHT;
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}
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if (!array_key_exists('timeout', $server)) {
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$server['timeout'] = self::DEFAULT_TIMEOUT;
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}
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if (!array_key_exists('retry_interval', $server)) {
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$server['retry_interval'] = self::DEFAULT_RETRY_INTERVAL;
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}
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if (!array_key_exists('status', $server)) {
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$server['status'] = self::DEFAULT_STATUS;
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}
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if (!array_key_exists('failure_callback', $server)) {
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$server['failure_callback'] = self::DEFAULT_FAILURE_CALLBACK;
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}
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if ($this->_options['compatibility']) {
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// No status for compatibility mode (#ZF-5887)
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$this->_memcache->addServer($server['host'], $server['port'], $server['persistent'],
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$server['weight'], $server['timeout'],
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$server['retry_interval']);
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} else {
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$this->_memcache->addServer($server['host'], $server['port'], $server['persistent'],
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$server['weight'], $server['timeout'],
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$server['retry_interval'],
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$server['status'], $server['failure_callback']);
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}
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}
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}
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/**
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* Test if a cache is available for the given id and (if yes) return it (false else)
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*
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* @param string $id Cache id
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* @param boolean $doNotTestCacheValidity If set to true, the cache validity won't be tested
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* @return string|false cached datas
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*/
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public function load($id, $doNotTestCacheValidity = false)
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{
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$tmp = $this->_memcache->get($id);
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if (is_array($tmp) && isset($tmp[0])) {
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return $tmp[0];
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}
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return false;
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}
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/**
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* Test if a cache is available or not (for the given id)
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*
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* @param string $id Cache id
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* @return mixed|false (a cache is not available) or "last modified" timestamp (int) of the available cache record
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*/
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public function test($id)
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{
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$tmp = $this->_memcache->get($id);
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if (is_array($tmp)) {
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return $tmp[1];
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}
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return false;
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}
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/**
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* Save some string datas into a cache record
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*
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* Note : $data is always "string" (serialization is done by the
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* core not by the backend)
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*
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* @param string $data Datas to cache
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* @param string $id Cache id
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* @param array $tags Array of strings, the cache record will be tagged by each string entry
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* @param int $specificLifetime If != false, set a specific lifetime for this cache record (null => infinite lifetime)
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* @return boolean True if no problem
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*/
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public function save($data, $id, $tags = array(), $specificLifetime = false)
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{
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$lifetime = $this->getLifetime($specificLifetime);
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if ($this->_options['compression']) {
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$flag = MEMCACHE_COMPRESSED;
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} else {
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$flag = 0;
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}
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// ZF-8856: using set because add needs a second request if item already exists
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$result = @$this->_memcache->set($id, array($data, time(), $lifetime), $flag, $lifetime);
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if (count($tags) > 0) {
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$this->_log(self::TAGS_UNSUPPORTED_BY_SAVE_OF_MEMCACHED_BACKEND);
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}
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return $result;
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}
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/**
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* Remove a cache record
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*
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* @param string $id Cache id
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* @return boolean True if no problem
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*/
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public function remove($id)
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{
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return $this->_memcache->delete($id, 0);
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}
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/**
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* Clean some cache records
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*
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* Available modes are :
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* 'all' (default) => remove all cache entries ($tags is not used)
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* 'old' => unsupported
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* 'matchingTag' => unsupported
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* 'notMatchingTag' => unsupported
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* 'matchingAnyTag' => unsupported
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*
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* @param string $mode Clean mode
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* @param array $tags Array of tags
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* @throws Zend_Cache_Exception
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* @return boolean True if no problem
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*/
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public function clean($mode = Zend_Cache::CLEANING_MODE_ALL, $tags = array())
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{
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switch ($mode) {
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case Zend_Cache::CLEANING_MODE_ALL:
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return $this->_memcache->flush();
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break;
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case Zend_Cache::CLEANING_MODE_OLD:
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$this->_log("Zend_Cache_Backend_Memcached::clean() : CLEANING_MODE_OLD is unsupported by the Memcached backend");
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break;
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case Zend_Cache::CLEANING_MODE_MATCHING_TAG:
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case Zend_Cache::CLEANING_MODE_NOT_MATCHING_TAG:
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case Zend_Cache::CLEANING_MODE_MATCHING_ANY_TAG:
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$this->_log(self::TAGS_UNSUPPORTED_BY_CLEAN_OF_MEMCACHED_BACKEND);
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break;
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default:
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Zend_Cache::throwException('Invalid mode for clean() method');
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break;
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}
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}
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/**
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* Return true if the automatic cleaning is available for the backend
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*
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* @return boolean
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*/
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public function isAutomaticCleaningAvailable()
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{
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return false;
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}
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/**
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* Set the frontend directives
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*
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* @param array $directives Assoc of directives
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* @throws Zend_Cache_Exception
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* @return void
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*/
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public function setDirectives($directives)
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{
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parent::setDirectives($directives);
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$lifetime = $this->getLifetime(false);
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if ($lifetime > 2592000) {
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// #ZF-3490 : For the memcached backend, there is a lifetime limit of 30 days (2592000 seconds)
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$this->_log('memcached backend has a limit of 30 days (2592000 seconds) for the lifetime');
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}
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if ($lifetime === null) {
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// #ZF-4614 : we tranform null to zero to get the maximal lifetime
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parent::setDirectives(array('lifetime' => 0));
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}
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}
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/**
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* Return an array of stored cache ids
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*
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* @return array array of stored cache ids (string)
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*/
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public function getIds()
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{
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$this->_log("Zend_Cache_Backend_Memcached::save() : getting the list of cache ids is unsupported by the Memcache backend");
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return array();
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}
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/**
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* Return an array of stored tags
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*
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* @return array array of stored tags (string)
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*/
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public function getTags()
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{
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$this->_log(self::TAGS_UNSUPPORTED_BY_SAVE_OF_MEMCACHED_BACKEND);
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return array();
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}
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/**
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* Return an array of stored cache ids which match given tags
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*
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* In case of multiple tags, a logical AND is made between tags
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*
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* @param array $tags array of tags
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* @return array array of matching cache ids (string)
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*/
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public function getIdsMatchingTags($tags = array())
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{
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$this->_log(self::TAGS_UNSUPPORTED_BY_SAVE_OF_MEMCACHED_BACKEND);
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return array();
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}
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/**
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* Return an array of stored cache ids which don't match given tags
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*
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* In case of multiple tags, a logical OR is made between tags
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*
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* @param array $tags array of tags
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* @return array array of not matching cache ids (string)
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*/
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public function getIdsNotMatchingTags($tags = array())
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{
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$this->_log(self::TAGS_UNSUPPORTED_BY_SAVE_OF_MEMCACHED_BACKEND);
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return array();
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}
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/**
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* Return an array of stored cache ids which match any given tags
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*
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* In case of multiple tags, a logical AND is made between tags
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*
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* @param array $tags array of tags
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* @return array array of any matching cache ids (string)
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*/
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public function getIdsMatchingAnyTags($tags = array())
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{
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$this->_log(self::TAGS_UNSUPPORTED_BY_SAVE_OF_MEMCACHED_BACKEND);
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return array();
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}
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/**
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* Return the filling percentage of the backend storage
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*
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* @throws Zend_Cache_Exception
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* @return int integer between 0 and 100
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*/
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public function getFillingPercentage()
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{
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$mems = $this->_memcache->getExtendedStats();
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$memSize = null;
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$memUsed = null;
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foreach ($mems as $key => $mem) {
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if ($mem === false) {
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$this->_log('can\'t get stat from ' . $key);
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continue;
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}
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$eachSize = $mem['limit_maxbytes'];
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$eachUsed = $mem['bytes'];
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if ($eachUsed > $eachSize) {
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$eachUsed = $eachSize;
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}
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$memSize += $eachSize;
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$memUsed += $eachUsed;
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}
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if ($memSize === null || $memUsed === null) {
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Zend_Cache::throwException('Can\'t get filling percentage');
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}
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return ((int) (100. * ($memUsed / $memSize)));
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}
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/**
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* Return an array of metadatas for the given cache id
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*
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* The array must include these keys :
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* - expire : the expire timestamp
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* - tags : a string array of tags
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* - mtime : timestamp of last modification time
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*
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* @param string $id cache id
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* @return array array of metadatas (false if the cache id is not found)
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*/
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public function getMetadatas($id)
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{
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$tmp = $this->_memcache->get($id);
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if (is_array($tmp)) {
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$data = $tmp[0];
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$mtime = $tmp[1];
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if (!isset($tmp[2])) {
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// because this record is only with 1.7 release
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// if old cache records are still there...
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return false;
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}
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$lifetime = $tmp[2];
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return array(
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'expire' => $mtime + $lifetime,
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'tags' => array(),
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'mtime' => $mtime
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);
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}
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return false;
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}
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/**
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* Give (if possible) an extra lifetime to the given cache id
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*
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* @param string $id cache id
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* @param int $extraLifetime
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* @return boolean true if ok
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*/
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public function touch($id, $extraLifetime)
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{
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if ($this->_options['compression']) {
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$flag = MEMCACHE_COMPRESSED;
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} else {
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$flag = 0;
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}
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$tmp = $this->_memcache->get($id);
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if (is_array($tmp)) {
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$data = $tmp[0];
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$mtime = $tmp[1];
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if (!isset($tmp[2])) {
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// because this record is only with 1.7 release
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// if old cache records are still there...
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return false;
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}
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$lifetime = $tmp[2];
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$newLifetime = $lifetime - (time() - $mtime) + $extraLifetime;
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if ($newLifetime <=0) {
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return false;
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}
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// #ZF-5702 : we try replace() first becase set() seems to be slower
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if (!($result = $this->_memcache->replace($id, array($data, time(), $newLifetime), $flag, $newLifetime))) {
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$result = $this->_memcache->set($id, array($data, time(), $newLifetime), $flag, $newLifetime);
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}
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return $result;
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}
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return false;
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}
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/**
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* Return an associative array of capabilities (booleans) of the backend
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*
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* The array must include these keys :
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* - automatic_cleaning (is automating cleaning necessary)
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* - tags (are tags supported)
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* - expired_read (is it possible to read expired cache records
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* (for doNotTestCacheValidity option for example))
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* - priority does the backend deal with priority when saving
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* - infinite_lifetime (is infinite lifetime can work with this backend)
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* - get_list (is it possible to get the list of cache ids and the complete list of tags)
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*
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* @return array associative of with capabilities
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*/
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public function getCapabilities()
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{
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return array(
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'automatic_cleaning' => false,
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'tags' => false,
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'expired_read' => false,
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'priority' => false,
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'infinite_lifetime' => false,
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'get_list' => false
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);
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}
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}
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